Old Union Church and Cemetery is a historic church and cemetery located in Reeve Township, Daviess County, Indiana. Built in 1858, the church is a one-story Greek Revival-style frame structure with clapboard siding and a gable roof, featuring a projecting entrance tower added around 1900. The nearby cemetery contains about 1,000 graves, with the earliest marked burial dating to 1823, and the property also includes a historic shelter house and privy privy.
It was listed on the National Register of Historic Places in 2005.